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Old 03 March 2008, 06:40   #1
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Country: Australia
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pump to inflate foldable quicksilver?

hi guys,

new to the forum, and new to inflatables,

recently purchased a 3.4m hypalon mercury quicksilver (foldable) with an 18hp on the back.

took it out for its maiden run and quickly noticed that the chambers seemed to be softer (approx 20min after) i first put it in the water.

the pump that i used was just some electric cheapy that i picked up at a supermarket.

Q- what is the best pump to used for a foldable boat that will be inflated and deflated numerous times during the year? i assume something with a gauge? is there a pump that is better than others? as the instructions point out NOT to used high pressure pumps. the recommended pressure is only 3.5psi....
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Old 03 March 2008, 08:31   #2
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Hi and welcome to the forum. Lots of SIB advice if you search, especially about folding wheels. You are probably finding that the tubes were under inflated at the beginning, cooled down in the water and lost pressure.

The cheapie pump most likely won't be upto the job. Manually, a foot pump is best, I've got a Bravo 2 with a pressure gauge and it works fine on a bigger boat. They (or an equivalent) should be readily available in chandlers or kite surfing suppliers - just check they have the right value fittings.

Some have recommended the Bravo 12 electic pump, this has a pressure limiter, I'm planning on getting one when I'm tired of the foot pump.

I've had trouble finding a supplier in Aus - the only reference I can find is to:

http://www.samallen.com.au/

look in their section on accessories for inflatable boats. I've not used them, so don't know if they retail, but it should be a start to find a local supplier. They also have a pressure gauge if you want to be accurate about your operating pressures.

Enjoy
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Old 03 March 2008, 10:29   #3
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Footpumps are hard work. The best bet is to use the cheap electric pump to get most of the air in - then use a double action stirrup/hand pump for the rest. They are available in most camping type shops in the UK - should be the same in OZ. They are double action so very quick. Don't pay much for one - they are pretty cheap if you shop around.

I never bother with a guage - my Quicksilver has pressure relief valves and they just blow off when there is enough air in there. You can judge it pretty well just by feel. Remember the harder the tubes the harder the ride so it's a compromise.
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Old 03 March 2008, 11:41   #4
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Quote:
Originally Posted by Clipper View Post
hi guys,

Q- what is the best pump to used for a foldable boat that will be inflated and deflated numerous times during the year? i assume something with a gauge? is there a pump that is better than others? as the instructions point out NOT to used high pressure pumps. the recommended pressure is only 3.5psi....
Electric with adjustable pressure limiter or vertical double action Bravo Pump type will be just fine. If you go for a manual pump inflator that has a manometer attacheded, the infating reading won't be accurate because the reading needle will be kind of jumping while inflating, when stopping inflating you won't have any pressure reading at the manometer base, because the sib air valve will be shut. Took the included manometer off my Bavo 6 pump and made an valve adapter that has the manometer attached/screwed to it, works perfect to inflate/read to 3.5 or 0.25 Bar which is the recommended working pressure.

If you ride on bumpy waters, the boat will bump as well, in that case don't wot, reduce speed, would not recommend to deflate the boat to match water conditions, the sib must work with it's recommended boat pressure so all floors are tight and so the transom. A client has just ruinned the last aluminum section fllor which is next to the transom for underi inflating his 380 sib in only 3 months use.

If you have a 18 HP engine, surely must be a Tohatsu, nice purchase, congrats.

Happy Boating
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Old 03 March 2008, 12:07   #5
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Quote:
Originally Posted by codprawn View Post
Remember the harder the tubes the harder the ride so it's a compromise.
Sort of. In choppy water, a SIB is going to ride hard no matter what. Softening the tubes *may* soften the ride, but it will be due to the boat flexing more to absorb the energy which will greatly accellerate wear.

Best to use recommended inflation pressure and just slow down.

BTW, water temp will drop the tube pressure significantly, especially if you inflate the boat on land/trailer on a warm day and drop it into cold water. If there's a large temp differential between air and water, it's best to inflate to slightly below recommended pressure before splashing, then top up once the tubes equalize with the water temp.

jky
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Old 03 March 2008, 14:06   #6
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If you watch the RNLI D class boats in action you will se why they are so good in the rough - they just bend as they go over the waves!!!

Dag Pike advocates adjusting tube pressures for conditions and he should know what he's on about!!!

Agreed though that on some types of boats it could increase the wear.
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Old 03 March 2008, 14:24   #7
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have bought one of these, pumps my 3mtr sib up in 3-4 mins, also de flates it as well, really very good and no need to finish off manually,
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Old 03 March 2008, 14:28   #8
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Originally Posted by codprawn View Post
If you watch the RNLI D class boats in action you will se why they are so good in the rough - they just bend as they go over the waves!!!

Dag Pike advocates adjusting tube pressures for conditions and he should know what he's on about!!!

Agreed though that on some types of boats it could increase the wear.
Yes, you are right, if incorrectly inflated some sibs will wear on the tube fabric located at the left/righ rubber ends side joinner have specially if the flloor fabric has less height than the rubber side joinners ends height, in the long run your transom will unglue/dislocate prematurely at the tubes extremes where they were factory welded.
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Old 03 March 2008, 14:40   #9
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have bought one of these, pumps my 3mtr sib up in 3-4 mins, also de flates it as well, really very good and no need to finish off manually,
This type of electric inflators will only inflate your sib to look as if it has reached full air pressure, still will need a final inflation device to have the inflation work completed to it's correct working pressure. Leaving in doubt use a pressure gauge and see for yourself. Is the same type of inflator used to inflate huge plastic toys, just air, not pressure. Use them sometimes specially when inflating new sibs out of their boxes and complete the job with a Bravo 6 Double Action Pump + hand manometer.

Happy Boating
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Old 03 March 2008, 22:05   #10
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i used the electric pump which really gave the impression that the boat was fully inflated, additionally, i pumped it up in the sun (27 degrees) on land, then dropped it in to 18 degree water. i now realize that this would have contributed to the deflation, when i took it back out of the water the sib re-inflated itself to become reasonably hard again.

i have a foot pump that came with the sib that looks like the pic in codprawns post, it is one that will inflate and deflate the boat, the electric pump i used looks similar to matt h post, but just a flimsier version.

another question to add; should i suck all the air out of the sib when putting it away, or will this cause damage? should i leave a tiny bit of air in it?

i hope i havent damaged the boat by not having enough pressure in it? i came back straight to shore when i realized. unfortunately there was some small chop that day.

yes, locozodiac, you are right it is a tohatsu 18hp, not sure? but it doesnt seem to plain well, too much power do you think?
here is a pic
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